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Next generation of EN 1997 common Nordic view

Below the common Nordic view concerning the structure and content of the next generation of EN 1997 is summerised.

The summary has been prepared by NMGEC7 and approved by the steering group of NMGEC7.

General remarks:
− The standard shall include both soil and rock; hence in the revised version headings for both soil and rock should be included for each topic.
− The standard shall give general rules, being an umbrella standard. It is not feasible that the standard contains specific requirements and details for all types of a structures or combination of structures.
− The standard should not include any design examples.
− In those cases there topics or applications are excluded from EN 1997, it needs to be clearly stated that they are not covered. E.g. if ground-freezing or soil nailing is not included it should be stated that EN 1997 is not applicable for these topics.
− EN 1997-2 should be included in the work to prepare the next generation of EN 1997.
− Definitions need to be included. E.g. difference between ground improvement and ground reinforcement, characteristic value, derived value

 
Additional topics that shall be included:
− Foundation on bedrock
− Structural design of piles, spread foundation, retaining structures need to be covered at least to some extension.
− The standard need to reflect that we today more and more consider 3D design and soil-structure interaction.
− Recommendations on how to use numerical methods
− Rock mechanics, include observational method, rock mass and prescriptive measure
− Design of ground improvement need to be covered by the standard
 
Nordic view on specific questions:

− There should only be one design approach that EN 1997 recommends for a specific application. However the recommended design approach could be different for e.g. piles and ground improvement.
− The partial factor on material for soil properties is related both to the structure and the soil. The fix value should be nationally determined.
− In the Nordic countries there are different ways to take the consequence classes into consideration. Applications on both the load and material are used. However, the common view is that the consequence of failure should influence the applied safety level.
− Model factor could be introduced for geotechnical structures to determine the bearing capacity. These factors should be nationally determined.
− “Table values” of soil properties should not be included as a part of the standard. They could be included in separate guidelines but then with remarks on under which conditions they are intended.
− The code should include requirement on site investigation and make sure that the recommendations are applicable for both soil and rock
− The section about ground investigation shall be divided into one general part and one part with three separate sections about soil, rock and water. Reference shall be made to available test standards.
− Related to ground investigation the following information shall be covered by the standard; information about how to go from measured value to the geotechnical parameter, definition of derived, characteristic and design values, and requirement on documentation.
Uppdaterat 2014-09-13
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